engine: Fix run problem with Docker for Windows
engine: Fix run problem with Docker for Windows

Current user group description cannot be retrieved on
Windows, use user name instead of group name in such cases.

Signed-off-by: Dmitry Fleytman <a8cf97adadec4e1b734a39bc5aea71b5741cfca1@daynix.com>

daynix/rebuild,rbld/rebuild,rbld/rebuild,rbld/rebuild,daynix/rebuild,daynix/rebuild